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High efficient photodegradation of organic dyes by TiO 2 /graphene composite under visible light radiation

Desalination and Water Treatment, ISSN: 1944-3986, Vol: 213, Page: 319-327
2021
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Article Description

An efficient visible light-responsive TiO 2 /graphene composite was synthesized easily by grinding. The structure and morphology of the composite were characterized by powder X-ray diffraction, Raman spectroscopy, ultra-high-resolution transmission electron microscopy, and field emission scanning electron microscopy. The photocatalytic characteristics were studied by degrading methylene blue under different conditions such as pH, catalyst dosage, different wt.% ratios of TiO 2 /graphene composites, irradiation time, and initial concentration of methylene blue. The results showed that the TiO 2 /2.0% graphene possessed much higher photocatalytic activities under visible light than pure TiO 2, displayed high photochemical stability under repeated irradiation, and can also effectively and selectively degraded a mixture of methyl orange and methylene blue. The degradation of methylene blue followed the pseudo-first-order kinetics of Langmuir–HinShelwood model. In addition, the possible mechanism of photocatalytic degradation process was proposed.

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